feat: 移除目标管理功能模块

删除了完整的目标管理功能，包括目标创建、编辑、任务管理等相关页面和组件。同时移除了相关的API服务、Redux状态管理、类型定义和通知功能。应用版本从1.0.20升级到1.0.21。

app/(tabs)/_layout.tsx

@@ -22,7 +22,6 @@ type TabConfig = {
 const TAB_CONFIGS: Record<string, TabConfig> = {
   statistics: { icon: 'chart.pie.fill', title: '健康' },
   fasting: { icon: 'timer', title: '断食' },
-  goals: { icon: 'flag.fill', title: '习惯' },
   challenges: { icon: 'trophy.fill', title: '挑战' },
   personal: { icon: 'person.fill', title: '个人' },
 };
@@ -38,7 +37,6 @@ export default function TabLayout() {
     const routeMap: Record<string, string> = {
       statistics: ROUTES.TAB_STATISTICS,
       fasting: ROUTES.TAB_FASTING,
-      goals: ROUTES.TAB_GOALS,
       challenges: ROUTES.TAB_CHALLENGES,
       personal: ROUTES.TAB_PERSONAL,
     };
@@ -182,10 +180,6 @@ export default function TabLayout() {
         <Icon sf="timer" drawable="custom_android_drawable" />
         <Label>断食</Label>
       </NativeTabs.Trigger>
-      <NativeTabs.Trigger name="goals">
-        <Icon sf="flag.fill" drawable="custom_settings_drawable" />
-        <Label>习惯</Label>
-      </NativeTabs.Trigger>
       <NativeTabs.Trigger name="challenges">
         <Icon sf="trophy.fill" drawable="custom_android_drawable" />
         <Label>挑战</Label>
@@ -205,7 +199,6 @@ export default function TabLayout() {
 
       <Tabs.Screen name="statistics" options={{ title: '健康' }} />
       <Tabs.Screen name="fasting" options={{ title: '断食' }} />
-      <Tabs.Screen name="goals" options={{ title: '习惯' }} />
       <Tabs.Screen name="challenges" options={{ title: '挑战' }} />
       <Tabs.Screen name="personal" options={{ title: '个人' }} />
     </Tabs>